User`s guide

42  Operation Theorem
4.3 D/A Conversion
The ACL-8316/12 has two unipolar analog output channels. To make the D/A
output connections from the appropriate D/A output, please refer Figure 4.3.
To D/A
D/A
-
+
Ref
-5 or -10
INT or Ext
A
nalo
g
GND
Pin-30
(
AO0
)
Pin-32
(
AO1
)
Pin-14
(
A.GND
)
Figure 4.3 Connection of Analog Output Connection
The operation of D/A conversion is much more simple than A/D operation.
You only need to write digital values into the D/A data registers and the
corresponding voltage will be output from the AO1 or AO2. Refer to section
4.11 for information about the D/A data register and section 4.12 for control
the D/A data format. The mathematical relationship between the digital
number DAn and the output voltage is formulated as following:
4096
DAn
VrefVout 
where the
Vref is the reference voltage, the Vout is the output voltage, and
the
DAn is the digital value in D/A data registers. Because of the D/A
channels use the 16 bits data bus, the digits can write to DAC by only one
outport instruction.
Digital Input
Binary Format
Analog Output
Unipolar
0 to 10V
Bipolar
-10V to 10V
FFF hex +9.9976V +9.9951V
800 hex +5.0000V 0.0000V
7FF hex +4.9976V -0.0049V
000 hex 0.0000V -10.0000V
1LSB 2.44mV 4.88mV